The study looked at how different diets affect the levels of important fatty acids in the eyes of guinea pigs. They found that guinea pigs born to mothers who had more of these fatty acids in their diet had higher levels of these fatty acids in their eyes. When guinea pigs were switched to a diet low in these fatty acids after weaning, the levels in their eyes decreased at different rates depending on their initial levels. This suggests that a good supply of these fatty acids early in life can help maintain levels in the eyes even when the diet changes later on.